It turns out that I can not load a boostrap4 template and rails throws me the following problem
Showing /Users/Brian/Desktop/nuevo/final_proyect/app/views/layouts/application.html.erb where line #10 raised:
couldn't find file 'main' with type 'text/css'
Checked in these paths:
/Users/Brian/Desktop/nuevo/final_proyect/app/assets/config
/Users/Brian/Desktop/nuevo/final_proyect/app/assets/images
/Users/Brian/Desktop/nuevo/final_proyect/app/assets/javascripts
/Users/Brian/Desktop/nuevo/final_proyect/app/assets/stylesheets
/Users/Brian/.rvm/gems/ruby-2.4.1/gems/coffee-rails-4.2.2/lib/assets/javascripts
/Users/Brian/.rvm/gems/ruby-2.4.1/gems/actioncable-5.2.0/lib/assets/compiled
/Users/Brian/.rvm/gems/ruby-2.4.1/gems/activestorage-5.2.0/app/assets/javascripts
/Users/Brian/.rvm/gems/ruby-2.4.1/gems/actionview-5.2.0/lib/assets/compiled
/Users/Brian/.rvm/gems/ruby-2.4.1/gems/turbolinks-source-5.1.0/lib/assets/javascripts
/Users/Brian/Desktop/nuevo/final_proyect/node_modules
/Users/Brian/Desktop/nuevo/final_proyect/vendor/css/font-awesome/img
Extracted source (around line #13):
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* It is generally better to create a new file per style scope.
*
*= require main
*= require_tree .
*= require_self
*= require bootstrap